25 #ifndef SHARE_RUNTIME_SYNCHRONIZER_HPP
26 #define SHARE_RUNTIME_SYNCHRONIZER_HPP
27
28 #include "memory/padded.hpp"
29 #include "oops/markWord.hpp"
30 #include "runtime/basicLock.hpp"
31 #include "runtime/handles.hpp"
32 #include "runtime/perfData.hpp"
33
34 class ObjectMonitor;
35 class ThreadsList;
36
37 #ifndef OM_CACHE_LINE_SIZE
38 // Use DEFAULT_CACHE_LINE_SIZE if not already specified for
39 // the current build platform.
40 #define OM_CACHE_LINE_SIZE DEFAULT_CACHE_LINE_SIZE
41 #endif
42
43 typedef PaddedEnd<ObjectMonitor, OM_CACHE_LINE_SIZE> PaddedObjectMonitor;
44
45 struct DeflateMonitorCounters {
46 volatile int n_in_use; // currently associated with objects
47 volatile int n_in_circulation; // extant
48 volatile int n_scavenged; // reclaimed (global and per-thread)
49 volatile int per_thread_scavenged; // per-thread scavenge total
50 double per_thread_times; // per-thread scavenge times
51 };
52
53 class ObjectSynchronizer : AllStatic {
54 friend class VMStructs;
55 public:
56 typedef enum {
57 owner_self,
58 owner_none,
59 owner_other
60 } LockOwnership;
61
62 typedef enum {
63 inflate_cause_vm_internal = 0,
64 inflate_cause_monitor_enter = 1,
65 inflate_cause_wait = 2,
66 inflate_cause_notify = 3,
67 inflate_cause_hash_code = 4,
68 inflate_cause_jni_enter = 5,
69 inflate_cause_jni_exit = 6,
70 inflate_cause_nof = 7 // Number of causes
71 } InflateCause;
72
114 static const char* inflate_cause_name(const InflateCause cause);
115
116 // Returns the identity hash value for an oop
117 // NOTE: It may cause monitor inflation
118 static intptr_t identity_hash_value_for(Handle obj);
119 static intptr_t FastHashCode(Thread* self, oop obj);
120
121 // java.lang.Thread support
122 static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj);
123 static LockOwnership query_lock_ownership(JavaThread* self, Handle h_obj);
124
125 static JavaThread* get_lock_owner(ThreadsList * t_list, Handle h_obj);
126
127 // JNI detach support
128 static void release_monitors_owned_by_thread(TRAPS);
129 static void monitors_iterate(MonitorClosure* m);
130
131 // GC: we current use aggressive monitor deflation policy
132 // Basically we deflate all monitors that are not busy.
133 // An adaptive profile-based deflation policy could be used if needed
134 static void deflate_idle_monitors(DeflateMonitorCounters* counters);
135 static void deflate_idle_monitors_using_JT();
136 static void deflate_global_idle_monitors_using_JT();
137 static void deflate_per_thread_idle_monitors_using_JT(JavaThread* target);
138 static void deflate_common_idle_monitors_using_JT(bool is_global, JavaThread* target);
139 static void deflate_thread_local_monitors(Thread* thread, DeflateMonitorCounters* counters);
140 static void prepare_deflate_idle_monitors(DeflateMonitorCounters* counters);
141 static void finish_deflate_idle_monitors(DeflateMonitorCounters* counters);
142
143 // For a given monitor list: global or per-thread, deflate idle monitors
144 static int deflate_monitor_list(ObjectMonitor** list_p,
145 int* count_p,
146 ObjectMonitor** free_head_p,
147 ObjectMonitor** free_tail_p);
148 // For a given in-use monitor list: global or per-thread, deflate idle
149 // monitors using a JavaThread.
150 static int deflate_monitor_list_using_JT(ObjectMonitor** list_p,
151 int* count_p,
152 ObjectMonitor** free_head_p,
153 ObjectMonitor** free_tail_p,
154 ObjectMonitor** saved_mid_in_use_p);
155 static bool deflate_monitor(ObjectMonitor* mid, oop obj,
156 ObjectMonitor** free_head_p,
157 ObjectMonitor** free_tail_p);
158 static bool deflate_monitor_using_JT(ObjectMonitor* mid,
159 ObjectMonitor** free_head_p,
160 ObjectMonitor** free_tail_p);
161 static bool is_async_deflation_needed();
162 static bool is_safepoint_deflation_needed();
163 static bool is_async_deflation_requested() { return _is_async_deflation_requested; }
164 static jlong last_async_deflation_time_ns() { return _last_async_deflation_time_ns; }
165 static bool request_deflate_idle_monitors(); // for whitebox test support and VM exit logging
166 static void set_is_async_deflation_requested(bool new_value) { _is_async_deflation_requested = new_value; }
167 static jlong time_since_last_async_deflation_ms();
168 static void oops_do(OopClosure* f);
169 // Process oops in thread local used monitors
170 static void thread_local_used_oops_do(Thread* thread, OopClosure* f);
171
172 // debugging
173 static void audit_and_print_stats(bool on_exit);
174 static void chk_free_entry(JavaThread* jt, ObjectMonitor* n,
175 outputStream * out, int *error_cnt_p);
176 static void chk_global_free_list_and_count(outputStream * out,
177 int *error_cnt_p);
178 static void chk_global_wait_list_and_count(outputStream * out,
179 int *error_cnt_p);
180 static void chk_global_in_use_list_and_count(outputStream * out,
181 int *error_cnt_p);
182 static void chk_in_use_entry(JavaThread* jt, ObjectMonitor* n,
183 outputStream * out, int *error_cnt_p);
184 static void chk_per_thread_in_use_list_and_count(JavaThread *jt,
185 outputStream * out,
186 int *error_cnt_p);
187 static void chk_per_thread_free_list_and_count(JavaThread *jt,
188 outputStream * out,
189 int *error_cnt_p);
190 static void log_in_use_monitor_details(outputStream * out);
191 static int log_monitor_list_counts(outputStream * out);
192 static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
193
194 static void do_safepoint_work(DeflateMonitorCounters* counters);
195
196 private:
197 friend class SynchronizerTest;
198
199 enum { _BLOCKSIZE = 128 };
200 // global list of blocks of monitors
201 static PaddedObjectMonitor* g_block_list;
202 static volatile bool _is_async_deflation_requested;
203 static jlong _last_async_deflation_time_ns;
204
205 // Function to prepend new blocks to the appropriate lists:
206 static void prepend_block_to_lists(PaddedObjectMonitor* new_blk);
207
208 // Process oops in all global used monitors (i.e. moribund thread's monitors)
209 static void global_used_oops_do(OopClosure* f);
210 // Process oops in monitors on the given list
211 static void list_oops_do(ObjectMonitor* list, OopClosure* f);
212
213 // Support for SynchronizerTest access to GVars fields:
214 static u_char* get_gvars_addr();
|
25 #ifndef SHARE_RUNTIME_SYNCHRONIZER_HPP
26 #define SHARE_RUNTIME_SYNCHRONIZER_HPP
27
28 #include "memory/padded.hpp"
29 #include "oops/markWord.hpp"
30 #include "runtime/basicLock.hpp"
31 #include "runtime/handles.hpp"
32 #include "runtime/perfData.hpp"
33
34 class ObjectMonitor;
35 class ThreadsList;
36
37 #ifndef OM_CACHE_LINE_SIZE
38 // Use DEFAULT_CACHE_LINE_SIZE if not already specified for
39 // the current build platform.
40 #define OM_CACHE_LINE_SIZE DEFAULT_CACHE_LINE_SIZE
41 #endif
42
43 typedef PaddedEnd<ObjectMonitor, OM_CACHE_LINE_SIZE> PaddedObjectMonitor;
44
45 class ObjectSynchronizer : AllStatic {
46 friend class VMStructs;
47 public:
48 typedef enum {
49 owner_self,
50 owner_none,
51 owner_other
52 } LockOwnership;
53
54 typedef enum {
55 inflate_cause_vm_internal = 0,
56 inflate_cause_monitor_enter = 1,
57 inflate_cause_wait = 2,
58 inflate_cause_notify = 3,
59 inflate_cause_hash_code = 4,
60 inflate_cause_jni_enter = 5,
61 inflate_cause_jni_exit = 6,
62 inflate_cause_nof = 7 // Number of causes
63 } InflateCause;
64
106 static const char* inflate_cause_name(const InflateCause cause);
107
108 // Returns the identity hash value for an oop
109 // NOTE: It may cause monitor inflation
110 static intptr_t identity_hash_value_for(Handle obj);
111 static intptr_t FastHashCode(Thread* self, oop obj);
112
113 // java.lang.Thread support
114 static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj);
115 static LockOwnership query_lock_ownership(JavaThread* self, Handle h_obj);
116
117 static JavaThread* get_lock_owner(ThreadsList * t_list, Handle h_obj);
118
119 // JNI detach support
120 static void release_monitors_owned_by_thread(TRAPS);
121 static void monitors_iterate(MonitorClosure* m);
122
123 // GC: we current use aggressive monitor deflation policy
124 // Basically we deflate all monitors that are not busy.
125 // An adaptive profile-based deflation policy could be used if needed
126 static void deflate_idle_monitors_using_JT();
127 static void deflate_global_idle_monitors_using_JT();
128 static void deflate_per_thread_idle_monitors_using_JT(JavaThread* target);
129 static void deflate_common_idle_monitors_using_JT(bool is_global, JavaThread* target);
130
131 // For a given in-use monitor list: global or per-thread, deflate idle
132 // monitors using a JavaThread.
133 static int deflate_monitor_list_using_JT(ObjectMonitor** list_p,
134 int* count_p,
135 ObjectMonitor** free_head_p,
136 ObjectMonitor** free_tail_p,
137 ObjectMonitor** saved_mid_in_use_p);
138 static bool deflate_monitor_using_JT(ObjectMonitor* mid,
139 ObjectMonitor** free_head_p,
140 ObjectMonitor** free_tail_p);
141 static bool is_async_deflation_needed();
142 static bool is_async_deflation_requested() { return _is_async_deflation_requested; }
143 static jlong last_async_deflation_time_ns() { return _last_async_deflation_time_ns; }
144 static bool request_deflate_idle_monitors(); // for whitebox test support and VM exit logging
145 static void set_is_async_deflation_requested(bool new_value) { _is_async_deflation_requested = new_value; }
146 static jlong time_since_last_async_deflation_ms();
147 static void oops_do(OopClosure* f);
148 // Process oops in thread local used monitors
149 static void thread_local_used_oops_do(Thread* thread, OopClosure* f);
150
151 // debugging
152 static void audit_and_print_stats(bool on_exit);
153 static void chk_free_entry(JavaThread* jt, ObjectMonitor* n,
154 outputStream * out, int *error_cnt_p);
155 static void chk_global_free_list_and_count(outputStream * out,
156 int *error_cnt_p);
157 static void chk_global_wait_list_and_count(outputStream * out,
158 int *error_cnt_p);
159 static void chk_global_in_use_list_and_count(outputStream * out,
160 int *error_cnt_p);
161 static void chk_in_use_entry(JavaThread* jt, ObjectMonitor* n,
162 outputStream * out, int *error_cnt_p);
163 static void chk_per_thread_in_use_list_and_count(JavaThread *jt,
164 outputStream * out,
165 int *error_cnt_p);
166 static void chk_per_thread_free_list_and_count(JavaThread *jt,
167 outputStream * out,
168 int *error_cnt_p);
169 static void log_in_use_monitor_details(outputStream * out);
170 static int log_monitor_list_counts(outputStream * out);
171 static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
172
173 static void do_safepoint_work();
174
175 private:
176 friend class SynchronizerTest;
177
178 enum { _BLOCKSIZE = 128 };
179 // global list of blocks of monitors
180 static PaddedObjectMonitor* g_block_list;
181 static volatile bool _is_async_deflation_requested;
182 static jlong _last_async_deflation_time_ns;
183
184 // Function to prepend new blocks to the appropriate lists:
185 static void prepend_block_to_lists(PaddedObjectMonitor* new_blk);
186
187 // Process oops in all global used monitors (i.e. moribund thread's monitors)
188 static void global_used_oops_do(OopClosure* f);
189 // Process oops in monitors on the given list
190 static void list_oops_do(ObjectMonitor* list, OopClosure* f);
191
192 // Support for SynchronizerTest access to GVars fields:
193 static u_char* get_gvars_addr();
|